Latest PDF of 4A0-113: Nokia OSPF Routing Protocol 2025

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4A0-113 exam Format | Course Contents | Course Outline | exam Syllabus | exam Objectives

FOLLOWING subjects ARE COVERED IN THE Q&As.
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Module 1 – IP routing review
- Introduction to IP routing
- Populating the routing table
- Equal-Cost Multipath Routing (ECMP)
- Route redistribution and route filtering using policies
- The Nokia 7750 SR architecture
- The IP packet header format
- IP addressing
- Layer-3 interfaces on a Nokia 7750 SR

Module 2 – Static routes
- Characteristics of static routes
- Failure detection options
- IPv6 static routes

Module 3 – Interior gateway protocols
- Interior gateway protocol overview
- Distance vector protocols
- Link-state protocols
- The shortest path first algorithm
- Link-state protocol message flooding
- Link-state protocol optimizations

Module 4 – Open shortest path first routing protocol (OSPF)
- OSPF basics
- OSPF packet types
- OSPF adjacency
- OSPF link-state advertisements in a single-area routing domain
- OSPF link-state advertisements in a multiple-area routing domain
- Advertising external prefixes into OSPF
- Different OSPF area types
- Loop-free alternate (LFA) paths and IP fast reroute
- OSPFv3 for IPv6
- OSPFv3 link-state advertisements in a single-area routing domain
- Multiple-area OSPFv3 routing domain

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4A0-113
Nokia OSPF Routing Protocol 2025
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Question: 764
of this configuration?
A. It aggregates multiple routes into a single summary route to reduce the size of OSPF routing updates
B. It restricts all routes from the specified area to be filtered out
C. It allows all routes from the specified area to be sent to the backbone area
D. It configures the area as a Totally Stubby area automatically Answer: A
Explanation: The command area range aggregates multiple routes into a single summary route, helping to minimize the size of OSPF routing updates and Boost efficiency.
Question: 765
Which mechanism does OSPF use to maintain loop-free routing in its topology?
A. Split horizon
B. Route poisoning
C. Dijkstra's algorithm
D. Distance vector routing
In an OSPF network, if an ABR is configured to summarize routes using the command area range , what is the expected behavior
Answer: C
Explanation: OSPF uses Dijkstra's algorithm, also known as the shortest path first (SPF) algorithm, to ensure loop-free routing within its topology by calculating the most efficient path to each destination.
Question: 766
In the context of OSPF, what does the term "synchronized" refer to regarding the link- state databases of neighboring routers?
1. Both routers have identical routing tables.
2. Both routers have exchanged hello packets successfully.
3. Both routers have matching LSDB entries and sequence numbers.
Answer: C
Explanation: "Synchronized" in OSPF refers to both routers having matching link-state database entries and sequence numbers, ensuring they have the same view of the network topology.
Question: 767
In OSPF, which of the following best describes the purpose of the OSPF Type 3 LSA, known as the Network LSA?
A. To summarize routes from one area to another.
B. To provide information about the routes learned from external sources.
C. To advertise the presence of a multi-access network and its attached routers.
D. To indicate the routing state of a specific link. Answer: C
Explanation: The OSPF Type 3 LSA (Network LSA) is used to advertise the presence of a multi-access network and the routers attached to it. This LSA is crucial for establishing the topology of the network and ensuring proper routing decisions.
Both routers have established a full adjacency state.
Question: 768
Which command would you use to display the OSPF neighbor table along with the state of each neighbor on a Nokia router?
1. show ip ospf neighbor
2. display ip ospf neighbor
3. show ospf database
4. display ospf neighbors Answer: B
troubleshooting OSPF adjacency issues.
Question: 769
Which OSPF feature allows routers to maintain a logical connection between two areas to facilitate communication across disjoint networks?
A. OSPF route redistribution
B. OSPF area summarization
C. OSPF virtual link
D. OSPF stub area configuration Answer: C
Explanation: OSPF virtual links allow routers to maintain a logical connection between two areas, enabling communication across disjoint networks while ensuring proper routing continuity.
Question: 770
In OSPF, what is the primary function of the "Link State Request" (LSR) message during
Explanation: The command display ip ospf neighbor provides a detailed view of the OSPF neighbor table, including the state of each neighbor, which is crucial for
the database synchronization process?
1. To acknowledge the receipt of LSAs from neighboring routers.
2. To advertise the router's current link state to all neighbors.
3. To request specific LSAs that the router does not currently have.
4. To initiate the OSPF adjacency formation process. Answer: C
Explanation: The Link State Request (LSR) message is used by OSPF routers to request specific LSAs from their neighbors that they do not currently possess, facilitating database synchronization.
What is the primary purpose of Link-local interface addresses in OSPFv3?
A. They provide a globally unique address for routing.
B. They enable routers to communicate via a non-routable address locally.
C. They facilitate the exchange of routing information across multiple hops.
D. They are used to identify network segments in a multi-access network. Answer: B
Explanation: Link-local interface addresses are used for local communication between nodes on the same link and are not routable beyond that link, making them suitable for OSPFv3 operations.
Question: 772
What is the expected behavior of OSPF when a new router joins an established OSPF area?
A. The new router will automatically become the Designated Router.
B. It will send a full database request to all existing routers.
C. It will start sending hello packets to establish adjacency.
D. The existing routers will ignore the new router until it is configured.
Question: 771
Answer: C
Explanation: When a new router joins an established OSPF area, it begins by sending hello packets to establish neighbor adjacencies with existing routers.
Question: 773
When OSPF is configured on a router, which of the following tasks is performed during the initial OSPF neighbor adjacency establishment process?
1. The router sends a Database Description (DBD) packet to its neighbors to summarize the LSAs it holds.
2. The router immediately updates its routing table upon receiving Hello packets from neighbors.
establishing adjacencies.
D. The router generates a Link-State Update (LSU) packet to advertise its routing table to all OSPF neighbors.
Answer: A
Explanation: During the initial neighbor adjacency establishment, the router sends a Database Description (DBD) packet to summarize its LSAs, facilitating the synchronization of the OSPF databases.
Question: 774
In OSPF, which type of LSA is generated by routers to describe their directly connected networks?
A. Network LSA
B. Summary LSA
C. Router LSA
D. ASBR Summary LSA Answer: C
Explanation: A Router LSA (Type 1 LSA) is generated by routers to advertise their
The router begins to flood its LSAs to all other routers in the OSPF area without
directly connected networks and their associated metrics.
Question: 775
When redistributing routes, which command can be used to set a specific metric for the redistributed routes in OSPF?
1. redistribute ospf 1 metric 20
2. route-map set-metric
3. default-metric 20
4. redistribute connected metric-type 2 Answer: C
routes, ensuring consistency in route selection criteria across different routing protocols.
Question: 776
To configure a static route to reach the network 203.0.113.0/24 via a next-hop of 198.51.100.1, which command is appropriate on a Nokia 7750 SR?
A. ip route 203.0.113.0 255.255.255.0 198.51.100.1
B. static-route 203.0.113.0/24 next-hop 198.51.100.1 C. route 203.0.113.0/24 via 198.51.100.1
D. static-route 203.0.113.0 255.255.255.0 next-hop 198.51.100.1 Answer: B
Explanation: The command "static-route 203.0.113.0/24 next-hop 198.51.100.1" correctly establishes a static route to the specified network with the appropriate next-hop address.
Question: 777
What does the OSPF command ip ospf cost achieve in terms of route selection?
Explanation: The default-metric command is used to set a specific metric for redistributed
1. It changes the route preference based on interface bandwidth.
2. It defines the maximum hop count for OSPF routes.
3. It adjusts the OSPF hello interval for the interface.
4. It modifies the default cost assigned to all OSPF interfaces. Answer: A
Explanation: The ip ospf cost command adjusts the cost assigned to an interface, influencing OSPF's route selection process based on bandwidth.
Question: 778
How does OSPF ensure reliable delivery of routing updates in a link-state environment?
B. OSPF does not certain reliable delivery; it is a best-effort protocol.
C. By periodically sending hello messages to maintain connectivity.
D. Through the acknowledgment of link-state updates by all routers. Answer: B
Explanation: OSPF operates as a best-effort protocol and does not certain reliable delivery of routing updates, unlike TCP.
Question: 779
Which of the following is TRUE regarding OSPF's handling of route summarization?
A. OSPF performs automatic route summarization by default at area boundaries.
B. Route summarization in OSPF can lead to a reduction in the size of the routing table and minimize the number of LSAs propagated.
C. OSPF allows for summarization of inter-area routes but not external routes.
D. Manual route summarization can only be configured on ABRs (Area Border Routers) and not on internal routers.
Answer: B
Explanation: Route summarization in OSPF can significantly reduce the routing table
A. By using TCP for transmission of all OSPF messages.
size and minimize LSA propagation, enhancing overall network efficiency.
Question: 780
In an OSPF network, what does the term "LSA flooding" refer to?
1. The process of sending LSAs to all routers in the local area.
2. The method used to prevent routing loops in OSPF.
3. The periodic update of router configurations across the network.
4. The automatic adjustment of OSPF costs based on link usage. Answer: A
Question: 781
What is the primary difference between OSPFv2 and OSPFv3 regarding network layer integration?
A. OSPFv3 supports only IPv4, while OSPFv2 supports both IPv4 and IPv6.
B. OSPFv2 uses link-local addresses for neighbor discovery, while OSPFv3 uses global addresses.
C. OSPFv3 is designed for IPv6 only and employs the use of link-local addresses for neighbor discovery and communication.
D. OSPFv2 allows for more area types compared to OSPFv3. Answer: C
Explanation: OSPFv3 is specifically designed for IPv6 networks and utilizes link-local addresses for neighbor discovery, differentiating it from OSPFv2, which is limited to IPv4.
Explanation: LSA flooding refers to the process of sending Link-State Advertisements (LSAs) to all routers in the local area to ensure they have the latest topology information.

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